Description
Class C21C : PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL
Subclass 1/04: Refining of pig-iron; Cast iron Removing impurities other than carbon, phosphorus, or sulfur
C21C 1/04
Sub-Class
Stats
- 18 US PATENTS IN FORCE
- 4 US APPLICATIONS PENDING
- 18 Total Patent Owners
- 121 TOTAL INVENTORS
Recent Patents
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11254992 | Method of dechromizing molten iron and method of manufacturing phosphate fertilizer raw material | Oct 16, 18 | Feb 22, 22 | 501 Nippon Steel Corporation |
| 11091816 | Method for ironmaking by smelting reduction in stir-generated vortex | Apr 28, 17 | Aug 17, 21 | Northeastern University |
| 9920390 | Method for preliminary treatment of molten iron | Jan 17, 13 | Mar 20, 18 | JFE STEEL CORPORATION |
| 9460248 | Method for predicting degree of contamination of molten steel during ladle exchange | Feb 27, 13 | Oct 04, 16 | HYUNDAI STEEL COMPANY |
| 9315875 | Method of refining molten iron | Jul 19, 12 | Apr 19, 16 | JFE STEEL CORPORATION |
| 8435323 | Batchwise working-up recycling materials in a rotatable reactor | May 11, 05 | May 07, 13 | BOLIDEN MINERAL AB |
| 8021459 | Method and apparatus for controlling metal separation | Jul 15, 04 | Sep 20, 11 | OUTOTEC OYJ |
| 7901482 | Removal method of nitrogen in molten steel | Feb 06, 07 | Mar 08, 11 | JFE STEEL CORPORATION |
| 7678176 | Method and apparatus for charging hot direct reduced iron from hot transport vessels into a melter or finisher | Jun 29, 07 | Mar 16, 10 | MIDREX TECHNOLOGIES, INC. |
| 7628308 | Method of replenishing an oxidation suppressing element in a solder bath | Jan 08, 03 | Dec 08, 09 | PANASONIC CORPORATION, SENJU METAL INDUSTRY CO., LTD., |
| 6280499 | Yield metal pouring system | Jun 19, 96 | Aug 28, 01 | Not available |
| 6129776 | Operation method of vertical furnace | Sep 23, 97 | Oct 10, 00 | NIPPON STEEL CORPORATION |
| 6042632 | Method of moderating temperature peaks in and/or increasing throughput of a continuous, top-blown copper converting furnace | Sep 24, 97 | Mar 28, 00 | KENNECOTT UTAH COPPER LLC |
| 6004504 | Method and apparatus for controlling bath level and measurement of bath characteristics | Mar 12, 98 | Dec 21, 99 | TECHINT COMPAGNIA TECNICA INTERNAZIONALE S.P.A. |
| 5984998 | Method and apparatus for off-gas composition sensing | Nov 14, 97 | Nov 16, 99 | AMERICAN IRON AND STEEL INSTITUTE |
| 5885326 | Process for removing technetium from iron and other metals | Jun 27, 97 | Mar 23, 99 | The United States of America as represented by the United States Department of Energy |
| 5507854 | Method and apparatus for measuring displacement of molten metal | Dec 12, 94 | Apr 16, 96 | JFE STEEL CORPORATION, NIRECO CORPORATION, NKK Corporation, |
| 5387275 | Process for extracting zinc present in liquid cast iron, means for the implementation of the process, and products thus obtained | Sep 17, 93 | Feb 07, 95 | ECOLE CENTRALE DE LILLE |
Recent Publications
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2024/0167,112 | METHOD FOR OPERATING CONVERTER AND METHOD FOR PRODUCING MOLTEN STEEL | Nov 04, 21 | May 23, 24 | JFE Steel Corporation |
| 2024/0068,060 | REFINING METHOD OF MOLTEN IRON AND MANUFACTURING METHOD OF MOLTEN STEEL USING SAME | Dec 09, 21 | Feb 29, 24 | JFE Steel Corporation |
| 2023/0399,710 | PROCESSES FOR PURIFYING IRON-BEARING MATERIALS | Feb 06, 23 | Dec 14, 23 | Not available |
| 2017/0342,515 | METHODS FOR MANGANESE REMOVAL OF CAST IRON | Nov 30, 15 | Nov 30, 17 | NANIWA ROKI CO.,LTD., KINOSHITA MANUFACTORY CO.,LTD., |
Top Owners in This Subclass
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Patents Issued To Date - By Filing Year
Average Time to Issuance
- 38 Months (last 2 years Issuances)
- 38 Months (last 5 years Issuances)